Bolted pipe joint



All/g. 27, 1935. 1 AA PERRY 2,012,793

BOLTED PIPE JOINT Filed May 5, 1934 Patented Aug.27,1935 i 21,012,793 l UNITED( STATES PATENT vori-"Ici:

e BOLTED PIPE JOINT Joseph A. Perry, Swarthmore, Pa., assignor to The United Gas Improvement Company, Philadelphia, Pa., a corporation of lPennsylvania,

Application May 5, 1934, Serial N'. 724,122

2 Claims. (Cl. 285-17) The present invention relates to bolted pipe cap directly attached to a bolt element and enjoints for underground metal piping. Y veloping the nut and threaded end of the bolt It has been determined by tests under my diand contacting at its rim with the face of the rection that in underground metal piping subject flange element. In the form illustrated, the cap 5 to electrolytic corrosion and provided withbolted is provided with the recess I2 threaded to engage 5` joints. the bolts and nuts, because of their posithe threads on the end of the bolt( Obviously tion and surface exposure, tend to lose a disproother methods of attaching the caps to bolt portionate quantity of metal as compared with elements may be employed; for instance, theyA the remainder of the joint,.andl joints tend to fail may be forced on over the nut and over the head by corrosion of the bolts and nuts when the reof the bolt, if that is not protected by othervlO mainder of the joint is in relatively good condimeans. tion. l Current tending to leave the joint by way of The principal object of the present invention the ends of the bolts or nuts leaves by Way Of o is to provide inexpensive and readily applicable the caps, carrying metal away from the caps inmeans for protecting the exposed ends of such stead of the bolt ends ornuts. The caps are made 15 bolt elements from such loss, thereby prolonging suiiiciently heavy to provide for a considerable the life of the joint. Y loss of metal while still providing protection.

To this and other ends hereinafter set forth or These caps may be made andv applied very l appearing, the invention, generally stated, comcheaply,'and Very materially prolong the life of prises vcaps housing'and enclosing the end structhe joint. 20

tures of the bolts and contacting at their rims Bolted leak clamps obviously present `the same with a face of the flange element of the joint problems and suggest the same solutions, and a and held to place by direct engagement of the. pipe to which a bolted leak clamp has been apcaps with a part of the end structures of the bolts. plied iS COnSdeIed a bOlted .OII- l The invention also comprises the improvements It Will bey ObVOuS t0 those Skilled in the art to 25 to be presently described and nally claimed. which the invention'relates that modicationsv The invention will be described in connection mayu be made in `details of construction and arwith the attached drawing which vforms a part of rangement in matters of mere form Without Vdethis specication and which shows a form of the parting `from the spirit of the invention which invention chosen for illustration, and in which: is not limited in respect to such matters or other- 30 Figure l is a cross-sectional view of a portion Wise than as the pI'iOI' art and the appended of a bolted bell and spigot pipe joint, showing a claims may require. form of the device of the present invention at- I Claim;` g l tached to the nut end of a, bolt, and Y l. Means for resisting the electrolytic corrosion Figure 2 is a cross-sectional view along the loss of metal from the bolt end structure of pipe 35 line x--x of Figure 1. joints, comprising the combination with a ilange Referring to the drawing: I indicates a portion element ofthe joints and the bolt end structures, of the spigot end of a pipe section. 2 indicates of Imetal caps hOuSing JChe boltl end structures the bell end of an adjoining section. 3 is a foland detachable therefrom and contacting with 40 lower ring which constitutes a ange element of the face oi the flange element and held to place 40 a. pipe joint. 4 isla rubber packing ring forced by direct engagement ofthe caps with the bolt into the joint between thebell and spigot by the end structures. follower ring when the latter is drawn up by bolt 2. Means for resisting the electrolytic corroelements. In the gures one bolt is indicated at sion loss of metal from the bolt end structure of 5, the head 6 of which engages the shoulder 'l on pipe joints, comprising the combination with a 45 the bell. 8 is an extension of the follower ring, flange element of the joints and the bolt end strucforming a protective sleeve around the shank and tures, of metal caps housing the bolt end struc- -V head of the bolt. 9 is a nut for drawing up the tures and detachable Vtherefrom and held to place bolt. lll indicates the threaded end of the bolt. by direct engagement of the caps with the bolt 5o A bolt end structure includes a squared or polygvend structures. f l onal part attached to the shank of the bolt per- JOSEPH A. PERRY. manently or by a. thread. l l is a protective metal l 

